Answer
Please see the work below.
Work Step by Step
We know that $HCN$ is the weakest acid
$K_a$ of $4.9\times 10^{-10}$ is less than $K_a$ of $1.7\times 10^{-15}$ of $HC_2H_3O_2$ and $HClO_4$ is a strong acid.
General Chemistry 10th Edition
by Ebbing, Darrell; Gammon, Steven D.
Published by
Cengage Learning
ISBN 10:
1-28505-137-8
ISBN 13:
978-1-28505-137-6
Chapter 16 - Acid-Base Equilibria - Questions and Problems - Page 700: 16.2
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